Multivariate Statistical Analyses of Fluoride and Other Physicochemical Parameters in Groundwater Samples of Two Megacities in Asia: Lahore and Sialkot

Table 4

Comparison of mean levels with WHO standards.

Parameter	Mean (Lahore)	Mean (Peshawar)	PAK-EPA	WHO
pH	7.8	7.3	7.0–8.5	7.0–8.5
Conductivity	604.5	754.5	600	600
Alkalinity	211.6	279.1	500	500
F^− (mg/L)	2.603	2.819	1.5	1.5
Cl^− (mg/L)	496.5	804.4	200	250
NO3^− (mg/L)	8.121	8.222	45	50
SO4^−2 (mg/L)	31.41	21.73	200	500